Device foe fuenaoes



(No Model.) I V 2 Sheets-Sheet 1. R. POTTER. AIR HEATING DEVICE FORFURNACES.

No. 492,428. Patented Feb. 28, 1893.

FIG. 4.

v(No Modeh) 2 Sheets-Sheet 2. R. POTTER.

AIR HEATING DEVICE FOR FURNACES Patented Feb. 28, 1893.-

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FIG- 7.

Puma 60.. Pno'rounio. wAsmne'ron a c UNITED STATES PATENT OFFICE.

RICHARD POTTER, OF ARDSLEY, NEAR BARNSLEY, ENGLAND.

AIR-HEATING DEVICE FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 492,428, dated February28, 1893.

Application filed October 15, 1892- Serial No. 449,040- (No model.)

To all whom it may concern.-

Be it known that I, RICHARD POTTER, furnace-builder, a subject of theQueen of Great Britain, residing at Ardsley, near Barnsley, in thecounty of York, England, have invented certain Improved Air-HeatingDevices for Furnaces, of which the followingis a specification.

My invention relates to certain improved and useful means for heatingair in connection with steam boilers such as are heated by gaseous fuel,and has for its object the securing in an improved manner a better andmore even combustion of the gases used in firing steam boilers togetherwith greater economy in the consumption of fuel, and by the means ofthis invention complete combustion of the fuel, perfect ignition, and athorough commingling of the hot air with the gaseous fuel, are effected.

I attain the object of my invention by the apparatus or arrangements ofmechanism illustrated in the accompanying drawings.

Figures 1, 2, and 3 are sectional elevations, and Fig. 4 is an endelevation of a double flued steam boiler with myinvention appliedthereto. Fig. 5, is a sectionalview of a gas producer with itsconnection to a steam boiler parts bein gin side elevation. Fig. 6, is aplan view of the same partly in section, and Figs. 7 and 8 are viewssimilar to Figs. 5 and 6 of a modification.

Throughout the drawings similar letters refer to similar parts in thefigures.

b, is the gas flue or conduit which is connected at any convenient pointwith the gas producer (as illustrated in Fig. 5) or with the blastfurnace, or with any system of generating gaseous fuel. Within this gasflue b, is suspended a wrought iron or steel tube a, through which airfor causing combustion passes and becomes highly heated in its course bythe hot gases carried from the point of generation to the point ofignition along the gas flue b. At the incoming end of the air tube a, anexpansion joint is formed by curving outward the extreme end of the tubeso that it dips into the water seal g, as shown.

0, is a branch tube or pipe connecting the air tube a, with thecombustion chamber cl.

e, is a short branch tube or pipe connecting the gas flue b, with thecombustion chamber d.

To regulate the flow of hot air and the gases respectively in the branchtubes 0, e, the valves fif, are provided. Near the delivery end of thebranch tube 6, a smaller air tube h, is fixed. This arrangement of tubesconstitutes an annular burner as ajetof hot air from the small tube It,is thrown into the center of the incoming stream of gases from thebranch tube e, resulting in a mixture of the elements by which completecombustion is accomplished.

The combustion chamber d, is constructed in a conical form having itswidest end connected to the boiler tubes c'; by this arrangement theflame is allowed room to expand and is assisted by the heat maintainedin the firebrick liningj, so that combustion is attained before theflame comes in contact with the surface of the boiler tubes 2'.

k, is a sight or inspection door placed con veniently-above and near theend of the ignition part of the combustion chamber d, and through whicha lighted torch can be introduced to set up ignition. In thisarrangement the wrought iron or steel tube a, is first fixed inside thegas producer 0*, and is carried down the annular tube 01, and along thegas flue or conduit 1), where the same means are adopted for causingignition and complete combustion as shown and described with referenceto Figs. 1, 2, 3, and 4 on Sheet 1.

In Figs. 7 and 8 there is shown an arrangement of the hot air tube a,within a gas producer c", and a simple method of mixing the gases andhot air. The producer 0 is placed in front of the steam boiler 12, theair tube a, has a regulating door 6*, at its delivery end. Near thecombustion chamber d, a number of small tubes 71/, are inserted for thepurpose of better mingling the hot air effectually among the gases; thecombustion chamber cl, is lined with fire bricks which assist ignition,the flame passes out of the combustion chamber into the boiler tubes '5,and is carried through and around the boiler in the usual manner.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In combination, the steam boiler, the gas conduit, leading thereto,the air fiue extending through said conduit to the steam boiler and outthrough the side of the conduit to the open air, the said tube havingits edges at its inlet end curved back and the Water seal g, on the gasconduit into which said edge extends, substantially as described.

2. In combination, the steam boiler, the gas conduit extending acrossone end of the boiler, the air flue, a, extending through the gasconduit and the branch pipes c, 6, extending respectively from the airflue and gas conduit and at right angles thereto each of said branchpipes having a valve and having their discharge openings arranged todischarge the air and gas to the boiler, substantially as described.

3. In combination, the steam boiler, the combustion chamber fitted tothe fire tube

